Mr. Mugen
you know your ready when you started to ask,,, you can learn on any size Heli ,, the bigger the more stable they are ,, the Qu ???? what can you afford to get and maintain ,,, the bigger they get the more they cost ... the Trex 450 seV2 is a great Machine the 600 is more stable ,,, if you go Nitro they fly great ,, you have to ask yourself what you are looking for ,,, when i started 1st Heli (1980s) all there was is Nitro 30-60 size and no sims ,,,